Ben Affleck Gives Justin Timberlake the Giggles at Their Big Premiere

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Ben Affleck Gives Justin Timberlake the Giggles at Their Big Premiere

Ben Affleck wasn't feeling insecure when he met up with Justin Timberlake at the world premiere of their new film, Runner Runner, at Planet Hollywood in Las Vegas yesterday. When Ben appeared on Late Night With Jimmy Fallon earlier this week, Ben revealed that he felt insecure while working on the film with the singer-turned-actor. He joked on the show, "He dances like Michael Jackson, sings, write music. There's 400 million boy bands, and he's the one guy that became a gigantic star."

Ben wasn't the only person on the red carpet who could bring a smile to Justin's face — a Dolce & Gabbana-clad Jessica Biel also turned up to support her Saint Laurent-wearing husband, and the couple even matched in black and white ensembles. The guys' costars Gemma Arterton and Sam Palladio were also on hand to introduce the film. Interestingly enough, Planet Hollywood has been a good place for former teen pop stars, as Justin's ex-girlfriend Britney Spears announced this week that she has signed on for a two-year residency at the Sin City casino.